5-Naphthalenediol
Hair dye precursor/coupler — reacts with primary intermediates under oxidative conditions to form final dye
Limited Data
Insufficient safety data available. Consider enriching this ingredient.
Details
Description
Hair dye precursor/coupler — reacts with primary intermediates under oxidative conditions to form final dye
Purpose
Function
Hair dye precursor/coupler — reacts with primary intermediates under oxidative conditions to form final dye
Profile
Properties
Silicone
Silicone free
Compliance
Regulatory Status
EU
Banned
Safety
POOR
US
Permitted
EU Max Concentration1.0%
Absorptionlow
Sensitizationmoderate
MoSadequate
NOAEL50 mg/kg
ConcernModerate
Verdict
Clastogenic in vitro (chromosomal aberrations in V79 cells, OECD 473) with negative in vivo micronucleus test. Eye irritant causing conjunctival redness and chemosis in rabbits. Kidney pigmentation observed at ≥100 mg/kg oral in rats. Log P = 1.70.
US Note
Permitted under coal tar hair dye exemption (21 CFR 73/74); subject to FDA caution labeling requirements
Assessment
Ratings
Reference
Identifiers
No registry identifiers available for this ingredient.